Jeff,
Ford Pick-ups have�one way rubber vents on the back of the cab--covered by the box or service body. They are about 4x8". The Tristar is a Doka, right?� Not sure if you have a hidden area for a vent like this.� I have turned on my vent fan�to high in my company truck and observed the rubber vents open from this pressure.
Chris C
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Subject: Vent Question

Looking for some insight.� the seal is so good on my Tristar that it is a
pain to get the door closed without slamming it.� If you roll the window
down an inch, the door closes easily.� I've been trying to think of a good
way to create a pressure release, but so far I've come up with nothing.� Any
ideas out there in Vanagon land?

Cheers,

Jeff